The simple answer to this movie is, "Yes," even if it looks a bit depressing. Because he's retiring, and because of the film.

This fascinating new documentary from American Movie director Chris Smith does several things at once: it is a portrait of two of the most inspired and original comic performers of the last half-century; an intimate, behind-the-scenes look at an actor's total immersion into an exceedingly challenging role; and a personal, heartfelt homage from one genius mischief-maker to another. Get ready to laugh. And squirm (via).